Just place it and it will stick perfectly!
This "rug sofa" allows you to freely change the position of the backrest by combining a rug, underrug, and backrest cushion.
There are three sizes available: a space-saving 1 tatami mat that can be used in a one-room apartment for a single person; a 2 tatami mat that is perfect for a living-dining room for two people in an apartment or a newly built family space; and a large 3 tatami mat that is large enough for the whole family to take a nap.